富氧燃烧条件对加热炉传热特性影响  

Effect of oxygen-enriched combustion conditions on heat transfer characteristics of reheating furnace

作　　者：陈德敏[1] 李宁 刘骁[2] 赵义博 郦秀萍 陈光 CHEN Demin;LI Ning;LIU Xiao;ZHAO Yibo;LI Xiuping;CHEN Guang(School of Civil Engineering and Architecture,Anhui University of Technology,Ma'anshan 243000,Anhui,China;Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China;Steel Industry Green and Intelligent Manufacturing Technology Center,China Iron and Steel Research Institute Group Co.,Ltd.,Beijing 100081,China;School of Energy and Environment,Anhui University of Technology,Ma'anshan 243000,Anhui,China)

机构地区：[1]安徽工业大学建筑工程学院,安徽马鞍山243000 [2]钢铁研究总院有限公司,北京100081 [3]中国钢研科技集团有限公司钢铁绿色智能化中心,北京100081 [4]安徽工业大学能源与环境学院,安徽马鞍山243000

出　　处：《钢铁》2024年第2期173-184,共12页Iron and Steel

基　　金：国家重点研发计划资助项目(2020YFB1711101);国家自然科学基金青年基金资助项目(51804002);安徽省教育厅科学研究资助项目(KJ2021A0376,KJ2021A0411)。

摘　　要：富氧燃烧具有提高理论燃烧温度、降低过剩空气系数和增强烟气辐射能力等优点,成为工业炉窑领域研究的热点,但目前轧钢加热炉内富氧燃烧位置及氧气体积分数变化对炉内流动和传热过程影响规律尚不明确。建立了加热炉炉内流动、富氧燃烧和传热数学模型,并在案例加热炉进行了应用,利用测试数据验证了模型的准确性后,分析了富氧燃烧分别位于预加热段、加热一段和加热二段时,炉内温度场、速度场和钢坯传热过程的变化规律,得到了富氧燃烧的最佳位置。其次,分析了固定富氧燃烧位置,氧气体积分数从21%变化到49%时,加热炉烟气热损失、炉膛热效率和节能率的变化规律,得出此种条件下氧气体积分数最佳范围。结果表明氧气体积分数固定时,预加热段、加热一段和加热二段分别实施富氧燃烧,热流密度变化最明显的炉内位置分别出现在17~25、17~34和29~44 m,这些位置平均热流密度增加值分别为4.95、7.42和7.95 kW/m^(2)。富氧燃烧位置分别位于预加热段、加热一段和加热二段,氧气体积分数为21%~37%时,氧气体积分数每增加1%,烟气损失分别下降0.25%、0.55%和0.72%,炉膛热效率分别提高0.13%、0.3%和0.39%,节能率分别提高0.2%、0.99%和1.09%,而氧气体积分数为37%~49%时,即使在加热二段实施富氧燃烧,烟气损失、炉膛热效率和节能率变化也并不明显。通过上述分析可以看出,轧钢加热炉中,热负荷较大的加热段实施富氧燃烧,且氧气体积分数为21%~37%时节能效果最明显。Oxygen-enriched combustion has the advantages of increasing theoretical combustion temperature,reducing excess air coefficient and enhancing flue gas radiation capacity,so it has become a hot research topic in the field of industrial furnace.However,the influence of oxygen-enriched combustion position and the volume percent of oxygen on the flow and heat transfer process in steel rolling furnace is still unclear.In this paper,the flow models,oxygen-enriched combustion model and heat transfer model in the heating furnace are established and applied in the case reheating furnace.After the accuracy of the model is verified by the test data,the variation rules of temperature field,velocity field and billet heat transfer process in the furnace are analyzed when the oxygen-enriched combustion is located in the preheating stage,the first heating stage and the second heating stage respectively.Then the best position of oxygen-enriched combustion is obtained.Secondly,the variation law of flue gas heat loss,furnace thermal efficiency and energy saving rate is analyzed when the volume percent of oxygen changes from 21%to 49%in the fixed oxygen-enriched combustion position.Then the optimal range of the volume percent of oxygen is obtained.The results show that when the volume percent of oxygen is fixed,oxygen-enriched combustion is carried out in the preheating stage,the first heating stage and the second heating stage,the most obvious heat flux changes occur in the furnace positions of 17-25,17-34 and 29-44 m,respectively.The average heat flux increases at these locations were 4.95,7.42,and 7.95 kW/m^(2),respectively.When the oxygen rich combustion positions are fixed in the pre heating section,heating section 1,or heating section 2,and the volume percent of oxygen varies between 21%and 37%,for each 1%increase in the volume percent of oxygen,the flue gas loss decreases by 0.25%,0.55%,and 0.72%,the furnace thermal efficiency increases by 0.13%,0.3%and 0.39%,and the energy saving rate increases by 0.2%,0.99%and 1.09%,respecti

关 键 词：加热炉 富氧燃烧 氧气体积分数 炉膛热效率 节能率 

分 类 号：TG307[金属学及工艺—金属压力加工]